config.java

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//-------------------------------------------------------------------------
// Copyright (c) 2000-2007 Ufinity. All Rights Reserved.
//
// This software is the confidential and proprietary information of
// Ufinity
//-------------------------------------------------------------------------
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// THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
// TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
// PARTICULAR PURPOSE, OR NON-INFRINGEMENT. GEMPLUS SHALL NOT BE
// LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING,
// MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
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// THIS SOFTWARE IS NOT DESIGNED OR INTENDED FOR USE OR RESALE AS ON-LINE
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//-------------------------------------------------------------------------
package org.xk.util;

import java.util.Properties;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.IOException;

/**
 * This class simplifies reading configuration files.
 * 
 * @author xzr
 */

public class Config {
    private static Properties _prop;
    private static String FILE_LOCATION = "/config.properties";

    /**
     * Initializes the config.
     * 
     * @param confFile
     *            the config file path it will search for the file in the class
     *            path if the path doesn't exist
     * @exception InstantiationException
     */
    static {
        try {
            InputStream is;

            File file = new File(FILE_LOCATION);
            if (file.exists()) {
                is = new FileInputStream(FILE_LOCATION);
            } else {
                System.out.println("input conf file path not exists:"
                        + FILE_LOCATION + ", trying to search from class path.");
                is = Config.class.getClassLoader().getResourceAsStream(
                        FILE_LOCATION.substring(FILE_LOCATION.lastIndexOf("/")+1));
               
            }

            _prop = new Properties();
            _prop.load(is);

            is.close();
        } catch (Exception e) {
            e.printStackTrace();
            throw new ExceptionInInitializerError(e);
        }
    }

    /**
     * Read a string value
     * 
     * @param key
     *            key from config file
     * @return String value if exists
     */
    public static String getString(String key) {
        if (_prop == null) {
            throw new RuntimeException("Config hasn't been initialized yet.");
        }
        if (_prop.containsKey(key))
            return _prop.getProperty(key);
        else
            throw new RuntimeException("No config key found for [" + key + "]."
                    + " from prop:" + _prop);
    }

    /**
     * Read a int value
     * 
     * @param key
     *            key from config file
     * @return int value if exists
     */
    public static int getInt(String key) {
        if (_prop == null) {
            throw new RuntimeException("Config hasn't been initialized yet.");
        }
        if (_prop.containsKey(key))
            return Integer.parseInt(_prop.getProperty(key));
        else
            throw new RuntimeException("No config key found for [" + key + "].");
    }

    /**
     * Read a long value
     * 
     * @param key
     *            key from config file
     * @return long value if exists
     */
    public static long getLong(String key) {
        if (_prop == null) {
            throw new RuntimeException("Config hasn't been initialized yet.");
        }
        if (_prop.containsKey(key))
            return Long.parseLong(_prop.getProperty(key));
        else
            throw new RuntimeException("No config key found for [" + key + "].");
    }

    /**
     * Read a boolean value
     * 
     * @param key
     *            key from config file
     * @return boolean true if value is 1 or true
     */
    public static boolean getBoolean(String key) {
        if (_prop == null) {
            throw new RuntimeException("Config hasn't been initialized yet.");
        }
        if (_prop.containsKey(key))
            if (_prop.getProperty(key).equals("true")
                    || _prop.getProperty(key).equals("1"))
                return true;
            else
                return false;
        else
            throw new RuntimeException("No config key found for [" + key + "].");
    }

    /**
     * Read a byte value
     * 
     * @param key
     *            key from config file
     * @return byte value if exists
     */
    public static byte getByte(String key) {
        if (_prop == null) {
            throw new RuntimeException("Config hasn't been initialized yet.");
        }
        if (_prop.containsKey(key))
            return Byte.parseByte(_prop.getProperty(key));
        else
            throw new RuntimeException("No config key found for [" + key + "].");
    }

}